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I am adding more RAM memory to my 2011 21-inch iMac. It currently has two 2 GB memory cards. Can I leave those two cards in place and simply add two new 4 GB memory cards, or do I need to remove the existing cards? Is it OK to mix 2 GB and 4 GB memory cards, provided I stay under Apple's 16 GB limit?

marked as duplicate by nohillside Oct 27 '15 at 14:35

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Absolutely. RAM can be mismatched and combined in every way. However, 2x2GB will not be as fast as 1x4GB memory. That being said, it shouldn't really matter that much.

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